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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › 4 glow plugs in 6 flights!?
03-31-2011 06:40 PM  10 years ago
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helidevil

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Brunswick, ME

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4 glow plugs in 6 flights!?
i keep blowing the glow plug in my hyper 50 and i think this is getting out of controll. like the tittle says above i would do a flight or 2 and the next time i try to start it up i have a burned out plug. im not running the engine too lean or rich, temp after the flights are 188-ish degrees, any idea what im doing wrong? this is a real time consumer...
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03-31-2011 06:55 PM  10 years ago
Jim Woodward

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Boca Raton, FL

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Is your glow driver frying your plug, or is it a simply normal type of glow plug igniter?
Jim
Team Futaba
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03-31-2011 07:28 PM  10 years ago
dasd

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Bartlett, IL

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Just a couple thoughts.

1. Your rear bearing is shot and contaminating the plugs.
2. You used RTV on the muffler and it's contaminating the plugs.
Formerly SunFunFlyer.
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03-31-2011 08:27 PM  10 years ago
BarracudaHockey

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Jacksonville FL

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Sounds like RTV to meAndy
AMA 77227
http://www.jaxrc.com
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04-01-2011 03:54 AM  10 years ago
helidevil

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Brunswick, ME

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the berrings are 3 flights old and i have no idea what rtv is and its the align 2in1 glow reg thingy
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04-01-2011 06:03 AM  10 years ago
KevinB

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Earth

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If you definitely aren't lean, then +1 for what dasd said.

Is this a new engine ? Or you just replaced the bearings ?

RTV is the high heat silicone some people put on the engine/muffler flange to stop it from leaking. If you use too much on the joint, little bits will break off and get sucked into the cylinder and destroy the glow plug element.

I would also rule out the glow driver as the problem by disconnecting it from the glow plug once the heli is started and see if your plugs suddenly start lasting normally. Better yet, just use a manual glow driver for a little while. If the problem stops, the 2in1 must be to blame.
You chould also check to see how bright the glow plug is when the 2in1 is turn on ( ie: is it giving too many volts to the plug?)

KevinB
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04-01-2011 06:33 AM  10 years ago
rexxigpilot

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rexxig2@comcast.net

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What about compression? I don't remember if there is a head shim in the OS50 or not. But if there was and you did not reinstall it after replacing the bearings, your compression may be too high for the fuel. Also, did you recently increase the nitro content of your fuel?
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04-01-2011 02:33 PM  10 years ago
helidevil

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Brunswick, ME

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oh ok then, NO RTV, i just replaced the berrings and i didnt touch the shim, its still on there, still coolpower 30
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04-01-2011 02:46 PM  10 years ago
KevinB

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Earth

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I didn't say couldn't use RTV. Just SPARINGLY.
I've used Permatex Ultra Copper silicone on my exhausts for years ( because I like my helis really clean. It also stops the flange from dripping when the heli is in storage. ) and have never had a problem. If you are going to use it, clean both surfaces with rubbing alcohol or another solvent to remove the oil, then smear a little amount of sealant around the muffler flange. I dab it with my fingertip so that there is an even film ( not layer ) across the flange. When I bolt the muffler on, there isn't any sealant squishing out of the flange. Then let it dry overnight.
When I go to remove the muffler, I can take out both bolts, and the muffler will stay in place. With a little bump from your hand it breaks free.

If you don't mind a little extra oil spray on your heli or the puddles on your storage shelf, then it's probably easier to not use sealant.

KevinB
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04-01-2011 08:43 PM  10 years ago
rudyy

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E. Amherst, NY

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Check your blown glow plug's filament. Does it physically still look good or is it totally mangled and blackened?

Please advise the result.
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04-01-2011 09:41 PM  10 years ago
helidevil

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Brunswick, ME

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it still looks like it could be used, the element looks like it is not damaged but i think it is up by the top
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04-01-2011 11:23 PM  10 years ago
rudyy

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E. Amherst, NY

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I suggest you completely tear the engine down and inspect the rear bearing. Maybe you have put in a defect one.
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04-03-2011 05:48 AM  10 years ago
human213

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malibu

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Agree
Bearing or sealant contamination is the main differential...

Tear it down.

m
Not everything that can be counted counts, and not everything that counts can be counted.
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04-06-2011 08:07 PM  10 years ago
MartyH

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USA

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+1 Bearing or sealant. This is not normal glowplug life as you realise. It's time for a teardown.
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04-20-2011 02:45 AM  10 years ago
Marko

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Trenton Ontario Can.

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What type of plug are you using?
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04-20-2011 02:49 AM  10 years ago
helidevil

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Brunswick, ME

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marko
...........wut?
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04-20-2011 03:19 AM  10 years ago
airdodger

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Johnston USA

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Can't just go by temperature. If it was that easy the manufacturers would just give a temp to run at, they don't. Plenty written about how to tune here on RR, look around and see if any fits.Chris
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04-20-2011 03:42 AM  10 years ago
Marko

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Trenton Ontario Can.

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What type of glow plug are you using? Try an OS#8 (cheap plugs won't last in performance engines) glow plug and see what happens. Your engine's carburator may be set a bit too lean(grey glow plug wire not shiny anymore) or the plug you are using is not rugged enough(wire smashed).
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04-25-2011 05:47 PM  10 years ago
smh20502

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Houston, Texas

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Curious if this got resolved.

If you're running 30% you may need to add the extra shim in the head. They don't come with the extra shim installed and many people for get to put to put them in.

I went through the same spell and ended up it was my shutdown routine. I used to let the engine idle till out of fuel, now I land, let the engine idle for about 30 seconds then slowly start bumping the trim down till the engine quits. Using this method I've significantly lowered my plug usage
Common sense isn't so common. Yes, there are stupid questions
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04-25-2011 06:05 PM  10 years ago
Santiago P

rrProfessor

Dayton

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i keep blowing the glow plug in my hyper 50
What plugs are you using?
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › 4 glow plugs in 6 flights!?
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